Tire-valve.



M. C. SCHWEINERT.

TIRE VALVE.

' A'PPLICATION FILED FEB. 8. 1913.

Patented Feb. 8, 1916.

j INVENTOR 1 WITNESSES:

MAXIMILIAN CHARLES SCHWEINERT, OF WEST HOBOKEN, NEW JERSEY.

TIRE-VALVE.

Specification of Letters Patent.

Patented Feb. 8, 1916.

Application filed February 8, 1913. Serial No. 747,062.

To all whom it may concern:

Be it known that I, MAxnrILIAN CHARLES SCHWEINERT, a citizen of theUnited States, residing at \Vest Hoboken, in the county of Hudson andState of New Jersey, have invented certain new and useful-Improvementsin Tire-Valves, of which the following is a specification.

This invention relates to valves which are particularly designed forpneumatic tires although it is susceptible of use in either connections.

The standard tire valve in use at the present time comprises a casing orshell which is adapted to be connected to a pneumatic tire or the innertube thereof, and to extend through a hole in the rim and the felly ofthe wheel. The valve mechanism is adapted to screw in the casing, andfor the purpose of easy inspection and replacement it is insertedthrough the outer or free end of the casing. The valve mechanismcomprises a seat member, a valve plunger, an operating spring for theplunger, a defiating pin attached to the plunger and extending throughthe seat member and spring, and a means usually a swiveled plugforholding the seat member in place within. the shell. The shell isprovided with a shoulder against which the seat member is pressed, apacking carried by the seat member being pressed against the shoulder tomake a tight joint between the seat member and the shell; These partsare fastened together to form a connected valve structure so thatessentially in use the valve comprises two separable parts, the casingand the so called valve insides. In this type of valve the valvemechanism or valve insides are entirely inclosed within the casing sothat there is no exterior joint in the latter through which leakage maytake place, and the whole structure is closed by a valve cap which fitson the outer end of the casing, such cap protecting the valve insidesfrom dust and securing an additional protection against leakage so thatif the valve insides should become leaky for any reason the air will beprevented from escaping from the shell by the cap. This type of valvehas gone into very extended use, and its various dimensions have becomepractically. fixed and standard. 1

The object of the present invention is to increase the capacity of thevalve for the ingress and egress of air while retaining the dimensionswhich have become standard,

and permitting free interchangeability. of the valve insides and casingswith those now on the market. As now constructed the area of theefiective passage between the valve plunger and the shell istheoretically suflicient to allow the free passage of all of the airwhich passes the other parts of the valve mechanism; that is to say,there is apparently no restriction of the air in passing around theplunger. I have found in practice, however, that the capacity of thevalve to permit the passage of air through it either inwardly oroutwardly is very materially increased by enlarging the diameter of thechamber in which the plunger works. Heretofore this chamber has been ofsmaller diameter than the opening in the top of the easing into whichthe valve seat and its plug have been screwed, this being necessary toprovide the shoulder hereinbefore referred to against which the valveseat packing engages in order to secure the necessary leak-tight jointbetween the seat and the casing. Whether the reduced capacity of thevalve around the plunger has been due to the more extended skin frictionat this point, or whether there is a peculiar backing up of the air atthis point I am unable to state, but the results in practice indicatethat by an enlargement of the valve chamber while retaining the samediameter of plunger I am enabled'to greatly increase the capacity of thevalve.

Referring to the drawings which illustrate the preferred form of theinvention, the figure is a diametrical section of the improved valve.

Referring to the drawing, let A indicate a valve casing which is usuallyscrcwthreaded on its exterior and provided With a foot B which isadapted to be passed within the tire or inner tube, the latter beingclamped in place by nuts engaging the exterior of the casing A, whichnuts are not shown. The diameter of the casing A is fixed or standardsince this cannot practically be enlarged owing to the standardizationof the hole through the rim and folly of the wheel to which the tire isapplied. At the top of. the casing is a nipple C which also is of fixeddimensions, the outer' diameter being adapted to receivethe usual valvecap, of which there are large quantities on the market, the cap andnipple being so proportioned that when the cap is in place the valvewill pass through the hole in the rim. The top of the nipple is bored atD and internally screw-threaded to receive the screw-threaded plug Ewhich is swiveled to the seat member F, and by means of which the seatmember is held in place within the casing. In order to retain theinterchangeability of valve mechanisms or insides now in largequantities upon the market, it is undesirable to change the internaldiameter of the bore D; it is also found that with a fixed externaldiameter there is insufficient metal to enlarge the bore. At the bottomof the bore is a seat G in the form of a tapered shoulder which isadapted to engage a packing H carried by the seat member F, and it ispractically necessary to retain the exact dimensions of this seatinorder to provide for the interchangeability of valve insides or plungersnow on the market in connection with the shell provided by the presentinvention.

Passing through openings in the plug E and seat F is a pin I havingfixed to it below the seat F a valve proper or plunger J, the pinextending below the plunger and carrying a spring K and spring cup orguideL, the end of the pin being upset at M to prevent the escape of thespring and cap and at N toprevent the separation of the plug and seatmember; Below the seat G is a valve chamber 0 in which works the plungerJ. Formerly the valve chamber 0 has been of the same diameter as thebottom of the seat G, the parts being constructed by drilling the.chamber and bore D of appropriate diameters and facing off the seat G.\Vith the type of valve insides shown which have gone into very extendeduse, the free space between the valve plunger and the shell, or in otherwords, the effective passage around the plunger in the valve chamber,has been theoretically sufficient to accommodate the air which passedthrough the plug and seat. According to the present invention, however,I enlarge the valve chamber to a larger diameter than the lower part ofthe seat G,

thereby greatly'enlarging the area of the passage around the plunger. Noreason has been apparent for making this change and the operation ofmaking the "alve has not accidentally produced the structure, since theenlargement of the chamber is a difficult operation owing to the factthat the diameter of the seat is relatively very small and the use ofthe ordinary counter-boring tools is prohibited. The result may besuccessfully accomplished, however, by first drillingthe casing to theend of the bore D and then using an eccentric drill for boring out thechamber. It is desirable in increasing the capacity of the valve tomake. such enlargements as'are possible through the valve seat and plug,but the main increase in capacity is secured by forming the valvechamber of a larger diameter than the bottom of the seat G.

The bottom of the valve chamber 0 may be, and preferably is.somewhatrestricted in diameter in order to make a better seat for the springholder L, and thus better guide the valve chamber and valve, as shown inthe drawing, the passages through and around the spring holder beingsufficient to pass any air which flows through the valve chamber.

It will be seen that by my invention 1 secure the desirable result ofenlarging the capacity of the valve while at the same time thedimensions of the valve which have become standard are not affected sothat the valve insides now on the market in large quantities can beinterchangeably used with the casing provided by the invention.

What I claim is 1. A valve fortires or the like, comprising a casing, aseat member in said casing, a seat on the interior of said casing, apacking engaging: said seat member and said seat, a valve chamber insaid casing below said seat member, and a plunger working in said valvecasing, said valve chamber being of larger diameter than the bottom ofsaid seat.

2. In a valve for tires or the like, the combination of a casing havinga screwthreaded bore at its end, a tapered seat below saidscrew-threaded bore, and a valve chamber below said seat, said chamberbeing of larger diameter than the bottom of said seat, and a valvemechanism fitting wholly within said valve casing, said valve mechanismcomprising a plug, a seat member swiveled to said plug, a'packingcarried by said member and engaging said seat,a plunger below said seatmember, a spring below said plunger, and a pin passing through saidspring, plunger, seat member and plug and connecting said parts.

3. A. valve for tires or the like comprising a casing, a seat member insaid casing having an effective opening for the passage of a a valvechamber below said seat mem- .-er, and a plunger working in said valvechamber and coacting with said seat memher, said valve chamber beingenlarged so that the effective passage for air between said plunger andthe walls of said valve chamber. considerably exceeds the efi'ectivepassage through said seat member.

4. In a valve for tires or the like, the combination of a casing havinga screwthreaded bore at its end, a tapered seat below saidscrew-threaded bore, and a valve chamber below said seat. said chamberbeing of larger diameter than the bottom of said seat,'and a valvemechanism fitting nwmer I plunger below said see-t member, a spring InWitness whereof, I have hereuntobelow said plunger, a spring holder forsaid signed my name in the presence of two sub- 10 spring, a pin passingthrough said spring, scribing Witnesses.

plunger, seat member, plug and spring holder and connecting said parts,and said MAXIMHIAN CHARLES SGHWEINERT valve chamber being restricted atits lower. Witnesses:

end to receive a portion of said spring EUGENE V. MYERS,

holder. THOMAS F. WALLACE.

